Best auto guide speed on the Atlas EQ-G ?
Posted 24 March 2009 - 04:05 PM
Posted 24 March 2009 - 05:25 PM
Raising the guide rate will cause the mount to react more quickly to guiding signals, and is most useful when using short focal length and/or low resolution in the guide scope and camera. Conversely, lowering the guide rate is most useful when using long focal length and/or high resolution in the guide scope/camera. Your setup is in between the extremes. I guide with 900mm focal length and a Meade DSI-C, resulting in about 3 arc-seconds/pixel, and I keep the pulse guiding rate at 1.5X sidereal.
Posted 24 March 2009 - 08:15 PM
My typical imaging scopes are the 110ED (770mm FL, f/7), or the C8 at f/6.3 (1280mm FL). Majority of the time it's the 110ED. The only CCD I use right now is the DSI II Pro or its color version. Either way the chip size is the same. My guider is always the SSAG on the ST80, 400mm, f/5.
Posted 24 March 2009 - 09:51 PM
I guess you're using PHD software for guiding. If you don't have it already, download the latest version (1.10.0) from
http://www.stark-labs.com. There's a new feature that lets you graph the corrections made by PHD in real time. Read the short section in the Help screen about it, and experiment with different guide rates. The graph may reveal an obvious benefit for a particular speed.